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Sample from 'Electrolytic cells 2: chemical production', a DVD that explains how electrolytic cells are used to produce materials widely used in industry. It explores the chemistry and basic operation of aluminium smelting; sodium production (using the Downs cell); chlorine and NaOH production (using the membrane cell). Using Faraday's laws of electrolysis, calculations for both aluminium and sodium production are demonstrated. This chapterised DVD is available from www.reesfilms.com